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process: refine core extent calculation to prevent stretching #45

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Merged
iosefa merged 1 commit into from
Oct 19, 2025
Merged

process: refine core extent calculation to prevent stretching #45

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21 changes: 13 additions & 8 deletions pyforestscan/process.py
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Original file line number Diff line number Diff line change
Expand Up @@ -231,11 +231,14 @@ def process_with_tiles(ept_file, tile_size, output_path, metric, voxel_size,

chm = core

# Derive core extent from CHM grid extent and actual pixel crop to avoid stretching
dx, dy = voxel_size[0], voxel_size[1]
grid_extent = extent # [x_min, x_max, y_min, y_max] as returned by calculate_chm
core_extent = (
tile_min_x + buffer_x,
tile_max_x - buffer_x,
tile_min_y + buffer_y,
tile_max_y - buffer_y,
grid_extent[0] + buffer_pixels_x * dx,
grid_extent[1] - buffer_pixels_x * dx,
grid_extent[2] + buffer_pixels_y * dy,
grid_extent[3] - buffer_pixels_y * dy,
)

create_geotiff(chm, result_file, srs, core_extent)
Expand Down Expand Up @@ -295,11 +298,13 @@ def process_with_tiles(ept_file, tile_size, output_path, metric, voxel_size,
if end_x > start_x and end_y > start_y:
result = result[start_y:end_y, start_x:end_x]

# Derive core extent from voxel grid extent and applied pixel crop to avoid stretching
dx, dy = voxel_size[0], voxel_size[1]
core_extent = (
tile_min_x + buffer_x,
tile_max_x - buffer_x,
tile_min_y + buffer_y,
tile_max_y - buffer_y,
spatial_extent[0] + buffer_pixels_x * dx,
spatial_extent[1] - buffer_pixels_x * dx,
spatial_extent[2] + buffer_pixels_y * dy,
spatial_extent[3] - buffer_pixels_y * dy,
)

if core_extent[1] <= core_extent[0] or core_extent[3] <= core_extent[2]:
Expand Down
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